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-
-/* -----------------------------------------------------------------------------------------------------------
-Software License for The Fraunhofer FDK AAC Codec Library for Android
-
-© Copyright 1995 - 2015 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
- All rights reserved.
-
- 1. INTRODUCTION
-The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
-the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
-This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
-
-AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
-audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
-independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
-of the MPEG specifications.
-
-Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
-may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
-individually for the purpose of encoding or decoding bit streams in products that are compliant with
-the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
-these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
-software may already be covered under those patent licenses when it is used for those licensed purposes only.
-
-Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
-are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
-applications information and documentation.
-
-2. COPYRIGHT LICENSE
-
-Redistribution and use in source and binary forms, with or without modification, are permitted without
-payment of copyright license fees provided that you satisfy the following conditions:
-
-You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
-your modifications thereto in source code form.
-
-You must retain the complete text of this software license in the documentation and/or other materials
-provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
-You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
-modifications thereto to recipients of copies in binary form.
-
-The name of Fraunhofer may not be used to endorse or promote products derived from this library without
-prior written permission.
-
-You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
-software or your modifications thereto.
-
-Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
-and the date of any change. For modified versions of the FDK AAC Codec, the term
-"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
-"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
-
-3. NO PATENT LICENSE
-
-NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
-ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
-respect to this software.
-
-You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
-by appropriate patent licenses.
-
-4. DISCLAIMER
-
-This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
-"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
-of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
-CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
-including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
-or business interruption, however caused and on any theory of liability, whether in contract, strict
-liability, or tort (including negligence), arising in any way out of the use of this software, even if
-advised of the possibility of such damage.
-
-5. CONTACT INFORMATION
-
-Fraunhofer Institute for Integrated Circuits IIS
-Attention: Audio and Multimedia Departments - FDK AAC LL
-Am Wolfsmantel 33
-91058 Erlangen, Germany
-
-www.iis.fraunhofer.de/amm
-amm-info@iis.fraunhofer.de
------------------------------------------------------------------------------------------------------------ */
-
-/************************* Fast MPEG AAC Audio Encoder **********************
-
- Initial author: M. Schug / A. Groeschel
- contents/description: bandwidth expert
-
-******************************************************************************/
-
-#include "channel_map.h"
-#include "bandwidth.h"
-#include "aacEnc_ram.h"
-
-typedef struct{
- INT chanBitRate;
- INT bandWidthMono;
- INT bandWidth2AndMoreChan;
-
-} BANDWIDTH_TAB;
-
-static const BANDWIDTH_TAB bandWidthTable[] = {
- {0, 3700, 5000},
- {12000, 5000, 6400},
- {20000, 6900, 9640},
- {28000, 9600, 13050},
- {40000, 12060, 14260},
- {56000, 13950, 15500},
- {72000, 14200, 16120},
- {96000, 17000, 17000},
- {576001,17000, 17000}
-};
-
-
-static const BANDWIDTH_TAB bandWidthTable_LD_22050[] = {
- { 8000, 2000, 2400},
- {12000, 2500, 2700},
- {16000, 3300, 3100},
- {24000, 6250, 7200},
- {32000, 9200, 10500},
- {40000, 16000, 16000},
- {48000, 16000, 16000},
- {360001, 16000, 16000}
-};
-
-static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
- { 8000, 2000, 2000},
- {12000, 2000, 2300},
- {16000, 2200, 2500},
- {24000, 5650, 7200},
- {32000, 11600, 12000},
- {40000, 12000, 16000},
- {48000, 16000, 16000},
- {64000, 16000, 16000},
- {360001, 16000, 16000}
-};
-
-static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = {
- { 8000, 2000, 2000},
- {12000, 2000, 2000},
- {24000, 4250, 7200},
- {32000, 8400, 9000},
- {40000, 9400, 11300},
- {48000, 11900, 14700},
- {64000, 14800, 16000},
- {76000, 16000, 16000},
- {360001, 16000, 16000}
-};
-
-static const BANDWIDTH_TAB bandWidthTable_LD_44100[] = {
- { 8000, 2000, 2000},
- {24000, 2000, 2000},
- {32000, 4400, 5700},
- {40000, 7400, 8800},
- {48000, 9000, 10700},
- {56000, 11000, 12900},
- {64000, 14400, 15500},
- {80000, 16000, 16200},
- {96000, 16500, 16000},
- {128000, 16000, 16000},
- {360001, 16000, 16000}
-};
-
-static const BANDWIDTH_TAB bandWidthTable_LD_48000[] = {
- { 8000, 2000, 2000},
- {24000, 2000, 2000},
- {32000, 4400, 5700},
- {40000, 7400, 8800},
- {48000, 9000, 10700},
- {56000, 11000, 12800},
- {64000, 14300, 15400},
- {80000, 16000, 16200},
- {96000, 16500, 16000},
- {128000, 16000, 16000},
- {360001, 16000, 16000}
-};
-
-typedef struct{
- AACENC_BITRATE_MODE bitrateMode;
- int bandWidthMono;
- int bandWidth2AndMoreChan;
-} BANDWIDTH_TAB_VBR;
-
-static const BANDWIDTH_TAB_VBR bandWidthTableVBR[]= {
- {AACENC_BR_MODE_CBR, 0, 0},
- {AACENC_BR_MODE_VBR_1, 13050, 13050},
- {AACENC_BR_MODE_VBR_2, 13050, 13050},
- {AACENC_BR_MODE_VBR_3, 14260, 14260},
- {AACENC_BR_MODE_VBR_4, 15500, 15500},
- {AACENC_BR_MODE_VBR_5, 48000, 48000},
- {AACENC_BR_MODE_SFR, 0, 0},
- {AACENC_BR_MODE_FF, 0, 0}
-
-};
-
-static INT GetBandwidthEntry(
- const INT frameLength,
- const INT sampleRate,
- const INT chanBitRate,
- const INT entryNo)
-{
- INT bandwidth = -1;
- const BANDWIDTH_TAB *pBwTab = NULL;
- INT bwTabSize = 0;
-
- switch (frameLength) {
- case 1024:
- pBwTab = bandWidthTable;
- bwTabSize = sizeof(bandWidthTable)/sizeof(BANDWIDTH_TAB);
- break;
- case 480:
- case 512:
- switch (sampleRate) {
- case 8000:
- case 11025:
- case 12000:
- case 16000:
- case 22050:
- pBwTab = bandWidthTable_LD_22050;
- bwTabSize = sizeof(bandWidthTable_LD_22050)/sizeof(BANDWIDTH_TAB);
- break;
- case 24000:
- pBwTab = bandWidthTable_LD_24000;
- bwTabSize = sizeof(bandWidthTable_LD_24000)/sizeof(BANDWIDTH_TAB);
- break;
- case 32000:
- pBwTab = bandWidthTable_LD_32000;
- bwTabSize = sizeof(bandWidthTable_LD_32000)/sizeof(BANDWIDTH_TAB);
- break;
- case (44100):
- pBwTab = bandWidthTable_LD_44100;
- bwTabSize = sizeof(bandWidthTable_LD_44100)/sizeof(BANDWIDTH_TAB);
- break;
- case 48000:
- case 64000:
- case 88200:
- case 96000:
- pBwTab = bandWidthTable_LD_48000;
- bwTabSize = sizeof(bandWidthTable_LD_48000)/sizeof(BANDWIDTH_TAB);
- break;
- }
- break;
- default:
- pBwTab = NULL;
- bwTabSize = 0;
- }
-
- if (pBwTab!=NULL) {
- int i;
- for (i=0; i<bwTabSize-1; i++) {
- if (chanBitRate >= pBwTab[i].chanBitRate &&
- chanBitRate < pBwTab[i+1].chanBitRate)
- {
- switch (frameLength) {
- case 1024:
- bandwidth = (entryNo==0)
- ? pBwTab[i].bandWidthMono
- : pBwTab[i].bandWidth2AndMoreChan;
- break;
- case 480:
- case 512:
- {
- INT q_res = 0;
- INT startBw = (entryNo==0) ? pBwTab[i ].bandWidthMono : pBwTab[i ].bandWidth2AndMoreChan;
- INT endBw = (entryNo==0) ? pBwTab[i+1].bandWidthMono : pBwTab[i+1].bandWidth2AndMoreChan;
- INT startBr = pBwTab[i].chanBitRate;
- INT endBr = pBwTab[i+1].chanBitRate;
-
- FIXP_DBL bwFac_fix = fDivNorm(chanBitRate-startBr, endBr-startBr, &q_res);
- bandwidth = (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw-startBw)),q_res) + startBw;
- }
- break;
- default:
- bandwidth = -1;
- }
- break;
- } /* within bitrate range */
- }
- } /* pBwTab!=NULL */
-
- return bandwidth;
-}
-
-
-AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(INT* bandWidth,
- INT proposedBandWidth,
- INT bitrate,
- AACENC_BITRATE_MODE bitrateMode,
- INT sampleRate,
- INT frameLength,
- CHANNEL_MAPPING* cm,
- CHANNEL_MODE encoderMode)
-{
- AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK;
- INT chanBitRate = bitrate/cm->nChannels;
-
- /* vbr */
- switch(bitrateMode){
- case AACENC_BR_MODE_VBR_1:
- case AACENC_BR_MODE_VBR_2:
- case AACENC_BR_MODE_VBR_3:
- case AACENC_BR_MODE_VBR_4:
- case AACENC_BR_MODE_VBR_5:
- if (proposedBandWidth != 0){
- /* use given bw */
- *bandWidth = proposedBandWidth;
- } else {
- /* take bw from table */
- switch(encoderMode){
- case MODE_1:
- *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono;
- break;
- case MODE_2:
- case MODE_1_2:
- case MODE_1_2_1:
- case MODE_1_2_2:
- case MODE_1_2_2_1:
- case MODE_1_2_2_2_1:
- case MODE_7_1_REAR_SURROUND:
- case MODE_7_1_FRONT_CENTER:
- *bandWidth = bandWidthTableVBR[bitrateMode].bandWidth2AndMoreChan;
- break;
- default:
- return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
- }
- }
- break;
- case AACENC_BR_MODE_CBR:
- case AACENC_BR_MODE_SFR:
- case AACENC_BR_MODE_FF:
-
- /* bandwidth limiting */
- if (proposedBandWidth != 0) {
- *bandWidth = FDKmin(proposedBandWidth, FDKmin(20000, sampleRate>>1));
- }
- else { /* search reasonable bandwidth */
-
- int entryNo = 0;
-
- switch(encoderMode){
- case MODE_1: /* mono */
- entryNo = 0; /* use mono bandwith settings */
- break;
-
- case MODE_2: /* stereo */
- case MODE_1_2: /* sce + cpe */
- case MODE_1_2_1: /* sce + cpe + sce */
- case MODE_1_2_2: /* sce + cpe + cpe */
- case MODE_1_2_2_1: /* (5.1) sce + cpe + cpe + lfe */
- case MODE_1_2_2_2_1: /* (7.1) sce + cpe + cpe + cpe + lfe */
- case MODE_7_1_REAR_SURROUND:
- case MODE_7_1_FRONT_CENTER:
- entryNo = 1; /* use stereo bandwith settings */
- break;
-
- default:
- return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
- }
-
- *bandWidth = GetBandwidthEntry(
- frameLength,
- sampleRate,
- chanBitRate,
- entryNo);
-
- if (*bandWidth==-1) {
- ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE;
- }
- }
- break;
- default:
- *bandWidth = 0;
- return AAC_ENC_UNSUPPORTED_BITRATE_MODE;
- }
-
- *bandWidth = FDKmin(*bandWidth, sampleRate/2);
-
- return ErrorStatus;;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 12:05:12 +0000